SU112358A1 - Double column pipe for over-drilling coal seams - Google Patents

Description

The subject of the invention is a double core pipe for drilling wells. The described column pipe differs from the known double core pipes of the same purpose in that the inner pipe is equipped with two ball bearings, which ensures its immobility, and also that the crown consists of two parts. The outer part of the crown has four flat springs to tear off and maintain the core, which simplifies the design of the double-core pipe, improves its operational quality and reduces the cost of its manufacture.

Between the bottom end and the subcarpus of the inner tube there is a concentric slotted hole for partial washing.

FIG. Figure 1 shows a diagram of a double core pipe for re-drilling coal seams; pas figs. 2-a general view of the pipe The pipe consists of the following parts: sub 1, valve ball 2, piston S, support balls 4, cotter pin 5, valve plug 6, rubber gasket 7, nuts clamping S, outer pipe 9, inner pipe receiving 10, the crown 11, the scoring crown having the outer part 12 and the inner part 13, the victors 14.

To preserve the structure of the coal core during the re-drilling of the pipe, the design of the pipe provides for: free rotation of the inner pipe 10 and partial admission of the washing liquid inside it.

Free rotation of the inner tube is carried out by staking in the under-crown 11 and the sub / support balls 4, on which the inner tube 10 is supported at the top by the valve plug 6 and at the bottom by the oblique collar.

The partial flushing of the receiving tube 10 is carried out through a millimeter concentric lumen 15, between the inner tube 10 and the sub-crown 11 and through the grooves in the crown 11.

In order to increase the removal and preservation of the core, a core core is provided in the form of four plate rigidly fixed to the outer moving part of the cutting crown 12 springs, which, when lifting the drill, open and clamp the carbon core.

No. 112358-2 -

The principle of the pipe is as follows.

Prior to drilling, the flushing fluid flows only through the central part of the pipe, thus achieving cleaning of the receiving pipe 10 from sludge and viscous mass of the mud.

During drilling, the central part of the pipe with the help of a ball-valve device 2 overlaps, and the interstitial space opens and the washing fluid through the water holes of the sub / and the annular space leaves through the water holes of the under-crown L into the butt of the scoring crown, and also partially through the concentric clearance / 5 into the receiving tube 10. Such circulation of the solution in the tube allows the coal that has been drilled in the chimney to be washed from the bottom and the inside of the tube and allows the column of the coal core to freely enter inside tube 10, and when the drill string is raised, to the spring device together with the external part of the scoring crown 12 by the pressure of the mud and due to friction, move and close the receiving tube 10.

Subject invention

Claims (3)

1. Double column pipe for re-drilling of single-crown and with internal movable pipe coal seams, characterized in that, in order to simplify and reduce the structure and increase the core removal and preservation, the coroic is made of two parts, external and internal, has four flat springs. 2. The form of the double-core pipe according to claim 1, characterized in that, in order to ensure immobility, the inner pipe has two sharpkovye supports (upper and lower). 3. The shape of the double column pipe according to p-1, characterized in that, in order to ensure partial washing of the inner pipe, there is a concentric slotted opening between its end face and the sub-crown.